US20070196594A1 - Photo-alignment material and liquid crystal display device and its manufacturing method using the same - Google Patents
Photo-alignment material and liquid crystal display device and its manufacturing method using the same Download PDFInfo
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- US20070196594A1 US20070196594A1 US11/785,733 US78573307A US2007196594A1 US 20070196594 A1 US20070196594 A1 US 20070196594A1 US 78573307 A US78573307 A US 78573307A US 2007196594 A1 US2007196594 A1 US 2007196594A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0384—Macromolecular compounds which are rendered insoluble or differentially wettable with ethylenic or acetylenic bands in the main chain of the photopolymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
- C09K2323/021—Inorganic, e.g. glass or silicon oxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
- C09K2323/025—Polyamide
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/02—Alignment layer characterised by chemical composition
- C09K2323/027—Polyimide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
Definitions
- the present invention relates to alignment layers for liquid crystal display devices (hereinafter abbreviated LCD). More particularly, it relates to a photo-alignment material having a photo-reactive functional group of ethenyl at a main-chain, and to the use of that material in liquid crystal displays.
- LCD liquid crystal display devices
- Flat panel LCD devices have become widely used as displays for mobile terminals, notebook computers, office equipment, video equipment, and the like. This is because flat panel LCD devices have advantages of small-size, lightweight, and low power consumption.
- an LCD includes a pair of substrates that are separated by a predetermined interval, and an interposed liquid crystal.
- An LCD has numerous functional requirements, including light transmission characteristics, operational response time, viewing angle, and contrast. Many of those requirements are impacted by the alignment characteristics of the liquid crystal molecules in the LCD. Indeed, uniformly aligned liquid crystal molecules are important to the electro-optical characteristics of LCDs.
- the alignment characteristics of LCDs are results of an alignment layer.
- a rubbing technique has been used to form that layer.
- a special cloth is rubbed over a substrate to form the alignment layer.
- the rubbing technique is a simple process, it has problems. For example, various process variables related to rubbing are difficult to accurately control. Furthermore, dust adsorption, unwanted scratches generated by the rubbing, and damage to thin film transistors caused by static electricity can also result from the rubbing. Such problems reduce the manufacturing yield and the performance of LCDs.
- Photo-alignment methods include photo-decomposition, photo-polymerization, and photo-isomerization. In these methods, optical anisotropy is brought about in a polymer layer by inducing a photo-reaction after most of the molecules facing a polarizing direction in the disorderly-aligned polymer molecules have absorbed light.
- liquid crystals are arranged by inducing optical anisotropy using a photo-decomposition reaction that selectively breaks partial bonds of the molecules in a specific direction by the application of linearly-polarized ultraviolet rays to a polymer layer consisting of a photo-alignment material.
- the material typically used for this method is polyimide.
- polyimide requires the application of ultraviolet rays for a relatively long time to induce liquid crystal alignment
- a polyimide alignment layer formed by photo-decomposition has a relatively-high thermal stability as compared to other photo-alignment layers fabricated by other methods.
- liquid crystals are arranged by polymerizing the molecules in a specific direction by applying linearly-polarized rays to a polymer layer where polymerization is to occur.
- cis/trans isomers are formed by a polarized light.
- liquid crystals are aligned by the direction generated from the transformation of the produced isomers.
- the alignment direction is reversibly controlled by applying light of a specific wave length, it is difficult to give a pre-tilt angle to a liquid crystal as well as to maintain the stability of the liquid crystal.
- the chemical structure of photo-alignment materials is mainly divided into two categories: a main chain, and side chains including photo-sensitive groups such as an alkyl group, an ethenyl group and the like.
- the main chain makes liquid crystal molecules arrange to face a predetermined direction, while the side chains form a pre-tilt angle.
- Photo-reactions take place at side chains having photosensitive groups when light is irradiated onto them.
- liquid crystal alignment depends on the side chains. Therefore, liquid crystal alignment of the photo-alignment material is controlled by the side chains, which include hydrocarbon branches such as alkyl, ethenyl and the like.
- the photo-alignment of a photo-alignment layer according to the related art is controlled by the side chains.
- the side chains are flexible and fragile, that alignment tends to be easily broken by thermal, physical, electrical, and photo shocks.
- the alignment tends to be hard to restore.
- the photo-alignment layer used in the photo-decomposition method has such poor photo-sensitivity that relatively high light intensity is required to break the predetermined bonds of the side chain or main chain.
- the actual liquid crystal alignment is relatively poor.
- the present invention is directed to a photo-alignment material, to a liquid crystal display device that incorporates that photo-alignment material, and to a method of manufacturing a liquid crystal display device that incorporates that photo-alignment material, wherein that photo-alignment material substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- a photo-alignment material according to the present invention includes at least a photo-reactive ethenyl functional group at a polymer main chain.
- a liquid crystal display device in accord with the principles of the present invention includes a first substrate, a second substrate, a liquid crystal layer between the first and second substrates, and a photo-alignment layer on the first and/or the second substrate.
- That photo-alignment layer includes an ethenyl group on a main chain of the photo-alignment material.
- a method of fabricating a liquid crystal display device includes preparing a first substrate and a second substrate, forming a photo-alignment layer having an ethenyl group at a main chain on at least the first substrate; and forming a liquid crystal layer between the first and second substrates.
- FIG. 1 shows a cross-sectional view of a general liquid crystal display device.
- a liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer formed between the first and second substrates, and a photo-alignment layer formed at least on the first substrate, wherein the photo-alignment layer is formed from a photo-alignment material having an ethenyl group in a main chain.
- the alignment stability with respect to thermal, physical, electrical, and photo shocks is increased by that photo-alignment layer.
- a photo-alignment material according to the present invention consists of polymers denoted by the following Chemical Formula 1.
- Components ‘A’, ‘B’, and ‘C’ are monomers constituting the polymer and are selectively coupled to produce a homopolymer, a copolymer, or a block-copolymer.
- the arrangement order of components ‘A’, ‘B’, and ‘C’ is not limited by the above Chemical Formula 1.
- subscripts ‘a’, ‘b’, and ‘c’ denote component ratios between the respective monomers, where 0 ⁇ a ⁇ 1, 0 ⁇ b ⁇ 1, and 0 ⁇ c ⁇ 1.
- Component ‘A’ is a monomer including a photo-reactive ethenyl group. That component is selected from groups designated in the following Chemical Formula 2, substituted-structure groups of Chemical Formula 2 with a halogen, a cyano, a nitro, an amino group and the like, and other substituted-structure groups with an alkyl, a haloalkyl, or a cyanoalkyl group having 1 to 10 cartons, or an aryl, an alkylaryl, a haloaryl, a haloalkyl aryl, a nitroaryl, or a cyanoaryl group having 3 to 8 carbons.
- Components ‘B’ and ‘C’ are selected independently from the following groups shown in Chemical Formula 3, substituted-structure groups of Chemical Formula 3 with a halogen, a cyano, a nitro, an amino group and the like, and other substituted-structure groups with carbonated groups of which carbon number n lies between 1 and 10 such as an alkyl, a haloalkyl, and a cyanoalkyl or other carbonated groups of which carbon number lies between 3 and 8 such as an alkylaryl, a haloaryl, a nitroaryl, a cyanoaryl and the like.
- Components ‘B’ and ‘C’ which are non-photosensitive components connected to component ‘A’ regardless of a photo-reactive ethenyl group of the present invention, increase the reaction of the photo-sensitive ethenyl groups, secures a marginal space for the reaction, or increases the reciprocal reaction with liquid crystals.
- a photo-alignment material according to the principles of the present invention is formed by connecting other main chains to a main chain including a photo-reactive ethenyl group.
- the photo-alignment material described above provides a photo-alignment layer in which photo-reactivity and alignment stability are improved.
- a liquid crystal display device using the photo-alignment material according to the present invention is explained with reference to FIG. 1 , which shows a cross-sectional view of a liquid crystal display device.
- a liquid crystal display device according to the principles of the present invention includes a first substrate 1 , a second substrate 2 , a liquid crystal layer 3 formed between the first and second substrates, and a spacer 20 that maintains a uniform interval between the substrates 1 and 2 .
- the first substrate 1 is a substrate for thin film transistor (hereinafter abbreviated TFT) switching devices that selectively turn data signals on/off in accordance with gate voltages.
- TFT thin film transistor
- the first substrate 1 is a gate line having a gate electrode 11 for a thin film transistor and a gate insulating layer 12 over the substrate and the gate electrode 11 .
- the gate insulating layer is beneficially a silicon nitride layer (SiNx).
- a semiconductor layer 13 is on the gate insulating layer 12 and over the gate electrode 11 .
- a data line 14 crosses the gate line.
- a source electrode 14 a and a drain electrode 14 b are on the semiconductor layer 13 .
- a first passivation layer 15 is formed over the substrate as shown in FIG.
- the first passivation layer 15 is beneficially of silicon nitride (SiNx) or BCB (Benzocyclo Butene).
- a pixel electrode 8 that connects to the drain electrode 14 b is formed on the first passivation layer 15 .
- the pixel electrode 8 is beneficially of ITO (indium tin oxide).
- a first alignment layer 4 a extends over the surface, including the pixel electrode 8 , as shown in FIG. 1 .
- the second substrate 2 supports a color filter layer for expressing colors.
- black matrices 16 that prevents light leakage
- a color filter layer 17 (RGB) between neighboring black matrices 16
- a second passivation layer 18 over the entire surface as shown in FIG. 1 .
- the second passivation layer 18 protects the color filter layer 17 .
- a common electrode 19 is then formed on the second passivation layer 18 .
- the common electrode 19 is beneficially comprised of ITO (indium-tin-oxide).
- a second alignment layer 4 b is then formed over the entire surface as shown in FIG. 1 .
- At least one of the first and second alignment layers 4 a and 4 b is formed from a photo-alignment material that is in accord with the principles of the present invention. If the other alignment layer is not formed from a photo-alignment layer material, it can be formed by rubbing.
- the photo-alignment material is uniformly coated on a substrate. That photo-alignment layer material is then thermally treated and dried in an oven. Subsequently, a structure that assists anisotropy of the liquid crystals is attained by irradiating polarized UV rays onto the exposed surface of the photo-alignment layer.
- the UV rays may be irradiated vertically and slantwise using unpolarized light, non-polarized light, linearly polarized light, partially polarized light or the like, depending on the alignment structure to be implemented.
- a photo-alignment layer according to the present invention enables improvement of the optical and thermal stability of the liquid crystal alignment, pre-tilt stability against electric stress, and improved shock-resistance. Moreover, the principles of the present invention enable improved display quality and an improved LCD display manufacturing method.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to alignment layers for liquid crystal display devices (hereinafter abbreviated LCD). More particularly, it relates to a photo-alignment material having a photo-reactive functional group of ethenyl at a main-chain, and to the use of that material in liquid crystal displays.
- 2. Background of the Related Art
- Flat panel LCD devices have become widely used as displays for mobile terminals, notebook computers, office equipment, video equipment, and the like. This is because flat panel LCD devices have advantages of small-size, lightweight, and low power consumption.
- In general, an LCD includes a pair of substrates that are separated by a predetermined interval, and an interposed liquid crystal.
- An LCD has numerous functional requirements, including light transmission characteristics, operational response time, viewing angle, and contrast. Many of those requirements are impacted by the alignment characteristics of the liquid crystal molecules in the LCD. Indeed, uniformly aligned liquid crystal molecules are important to the electro-optical characteristics of LCDs.
- The alignment characteristics of LCDs are results of an alignment layer. Generally, a rubbing technique has been used to form that layer. In that technique, a special cloth is rubbed over a substrate to form the alignment layer. While the rubbing technique is a simple process, it has problems. For example, various process variables related to rubbing are difficult to accurately control. Furthermore, dust adsorption, unwanted scratches generated by the rubbing, and damage to thin film transistors caused by static electricity can also result from the rubbing. Such problems reduce the manufacturing yield and the performance of LCDs.
- Because of the forgoing problems, significant effort has been expended in developing alignment techniques that do not use mechanical rubbing. In particular, photo-alignment methods could solve the static electricity and dust problems, as well as improve the viewing angle.
- Photo-alignment methods include photo-decomposition, photo-polymerization, and photo-isomerization. In these methods, optical anisotropy is brought about in a polymer layer by inducing a photo-reaction after most of the molecules facing a polarizing direction in the disorderly-aligned polymer molecules have absorbed light.
- In the photo-decomposition method, liquid crystals are arranged by inducing optical anisotropy using a photo-decomposition reaction that selectively breaks partial bonds of the molecules in a specific direction by the application of linearly-polarized ultraviolet rays to a polymer layer consisting of a photo-alignment material. The material typically used for this method is polyimide. Although polyimide requires the application of ultraviolet rays for a relatively long time to induce liquid crystal alignment, a polyimide alignment layer formed by photo-decomposition has a relatively-high thermal stability as compared to other photo-alignment layers fabricated by other methods.
- In the photo-polymerization method, liquid crystals are arranged by polymerizing the molecules in a specific direction by applying linearly-polarized rays to a polymer layer where polymerization is to occur.
- In the photo-isomerization method, cis/trans isomers are formed by a polarized light. Thus, liquid crystals are aligned by the direction generated from the transformation of the produced isomers. Although the alignment direction is reversibly controlled by applying light of a specific wave length, it is difficult to give a pre-tilt angle to a liquid crystal as well as to maintain the stability of the liquid crystal.
- The chemical structure of photo-alignment materials is mainly divided into two categories: a main chain, and side chains including photo-sensitive groups such as an alkyl group, an ethenyl group and the like. The main chain makes liquid crystal molecules arrange to face a predetermined direction, while the side chains form a pre-tilt angle.
- Photo-reactions take place at side chains having photosensitive groups when light is irradiated onto them. Thus, liquid crystal alignment depends on the side chains. Therefore, liquid crystal alignment of the photo-alignment material is controlled by the side chains, which include hydrocarbon branches such as alkyl, ethenyl and the like.
- Unfortunately, related art photo-alignment materials, and LCDs using the same, have problems. As noted, the photo-alignment of a photo-alignment layer according to the related art is controlled by the side chains. As the side chains are flexible and fragile, that alignment tends to be easily broken by thermal, physical, electrical, and photo shocks. Furthermore, the alignment tends to be hard to restore. Additionally, the photo-alignment layer used in the photo-decomposition method has such poor photo-sensitivity that relatively high light intensity is required to break the predetermined bonds of the side chain or main chain. Finally, in general, with related art photo-alignment layers the actual liquid crystal alignment is relatively poor.
- Accordingly, the present invention is directed to a photo-alignment material, to a liquid crystal display device that incorporates that photo-alignment material, and to a method of manufacturing a liquid crystal display device that incorporates that photo-alignment material, wherein that photo-alignment material substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- Additional features and advantages of the invention will be set forth in the description that follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- To achieve these and other advantages, and in accord with the principles of the present invention as embodied and broadly described, a photo-alignment material according to the present invention includes at least a photo-reactive ethenyl functional group at a polymer main chain.
- In another aspect, a liquid crystal display device in accord with the principles of the present invention includes a first substrate, a second substrate, a liquid crystal layer between the first and second substrates, and a photo-alignment layer on the first and/or the second substrate. That photo-alignment layer includes an ethenyl group on a main chain of the photo-alignment material.
- In another aspect, a method of fabricating a liquid crystal display device according to the principles of the present invention includes preparing a first substrate and a second substrate, forming a photo-alignment layer having an ethenyl group at a main chain on at least the first substrate; and forming a liquid crystal layer between the first and second substrates.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
- The accompanying
FIG. 1 , which is included to provide a further, understanding of the invention and which is incorporated in and constitutes a part of this specification, illustrates an embodiment of the invention and together with the description serves to explain the principles of the invention. Specifically,FIG. 1 shows a cross-sectional view of a general liquid crystal display device. - Reference will be made in detail to an illustrated preferred embodiment of the present invention, the example of which is illustrated in the accompanying drawing. In the illustrated embodiment a liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer formed between the first and second substrates, and a photo-alignment layer formed at least on the first substrate, wherein the photo-alignment layer is formed from a photo-alignment material having an ethenyl group in a main chain. The alignment stability with respect to thermal, physical, electrical, and photo shocks is increased by that photo-alignment layer. More specifically, a photo-alignment material according to the present invention consists of polymers denoted by the following Chemical Formula 1.
- Components ‘A’, ‘B’, and ‘C’ are monomers constituting the polymer and are selectively coupled to produce a homopolymer, a copolymer, or a block-copolymer. The arrangement order of components ‘A’, ‘B’, and ‘C’ is not limited by the above Chemical Formula 1. Furthermore, subscripts ‘a’, ‘b’, and ‘c’ denote component ratios between the respective monomers, where 0<a≦1, 0≦b<1, and 0≦c<1.
- Component ‘A’ is a monomer including a photo-reactive ethenyl group. That component is selected from groups designated in the following Chemical Formula 2, substituted-structure groups of Chemical Formula 2 with a halogen, a cyano, a nitro, an amino group and the like, and other substituted-structure groups with an alkyl, a haloalkyl, or a cyanoalkyl group having 1 to 10 cartons, or an aryl, an alkylaryl, a haloaryl, a haloalkyl aryl, a nitroaryl, or a cyanoaryl group having 3 to 8 carbons.
Components ‘B’ and ‘C’ are selected independently from the following groups shown inChemical Formula 3, substituted-structure groups ofChemical Formula 3 with a halogen, a cyano, a nitro, an amino group and the like, and other substituted-structure groups with carbonated groups of which carbon number n lies between 1 and 10 such as an alkyl, a haloalkyl, and a cyanoalkyl or other carbonated groups of which carbon number lies between 3 and 8 such as an alkylaryl, a haloaryl, a nitroaryl, a cyanoaryl and the like. - Components ‘B’ and ‘C’, which are non-photosensitive components connected to component ‘A’ regardless of a photo-reactive ethenyl group of the present invention, increase the reaction of the photo-sensitive ethenyl groups, secures a marginal space for the reaction, or increases the reciprocal reaction with liquid crystals.
- Therefore, a photo-alignment material according to the principles of the present invention is formed by connecting other main chains to a main chain including a photo-reactive ethenyl group.
- The photo-alignment material described above provides a photo-alignment layer in which photo-reactivity and alignment stability are improved.
- A liquid crystal display device using the photo-alignment material according to the present invention is explained with reference to
FIG. 1 , which shows a cross-sectional view of a liquid crystal display device. Referring toFIG. 1 , a liquid crystal display device according to the principles of the present invention includes afirst substrate 1, asecond substrate 2, aliquid crystal layer 3 formed between the first and second substrates, and aspacer 20 that maintains a uniform interval between thesubstrates - The
first substrate 1 is a substrate for thin film transistor (hereinafter abbreviated TFT) switching devices that selectively turn data signals on/off in accordance with gate voltages. To that end, on thefirst substrate 1 are a gate line having agate electrode 11 for a thin film transistor and agate insulating layer 12 over the substrate and thegate electrode 11. The gate insulating layer is beneficially a silicon nitride layer (SiNx). Asemiconductor layer 13 is on thegate insulating layer 12 and over thegate electrode 11. Adata line 14 crosses the gate line. Asource electrode 14 a and adrain electrode 14 b are on thesemiconductor layer 13. Afirst passivation layer 15 is formed over the substrate as shown inFIG. 1 , including over thesource electrode 14 a and thedrain electrode 14 b. Thefirst passivation layer 15 is beneficially of silicon nitride (SiNx) or BCB (Benzocyclo Butene). Apixel electrode 8 that connects to thedrain electrode 14 b is formed on thefirst passivation layer 15. Thepixel electrode 8 is beneficially of ITO (indium tin oxide). Furthermore, afirst alignment layer 4 a extends over the surface, including thepixel electrode 8, as shown inFIG. 1 . - The
second substrate 2 supports a color filter layer for expressing colors. On thesecond substrate 2 areblack matrices 16 that prevents light leakage, a color filter layer 17 (RGB) between neighboringblack matrices 16, and asecond passivation layer 18 over the entire surface as shown inFIG. 1 . Thesecond passivation layer 18 protects thecolor filter layer 17. Acommon electrode 19 is then formed on thesecond passivation layer 18. Thecommon electrode 19 is beneficially comprised of ITO (indium-tin-oxide). Asecond alignment layer 4 b is then formed over the entire surface as shown inFIG. 1 . - At least one of the first and
second alignment layers - To form a photo-alignment layer using a photo-alignment material as described above (having an ethenyl group in the main chain), the photo-alignment material is uniformly coated on a substrate. That photo-alignment layer material is then thermally treated and dried in an oven. Subsequently, a structure that assists anisotropy of the liquid crystals is attained by irradiating polarized UV rays onto the exposed surface of the photo-alignment layer. The UV rays may be irradiated vertically and slantwise using unpolarized light, non-polarized light, linearly polarized light, partially polarized light or the like, depending on the alignment structure to be implemented.
- A photo-alignment layer according to the present invention enables improvement of the optical and thermal stability of the liquid crystal alignment, pre-tilt stability against electric stress, and improved shock-resistance. Moreover, the principles of the present invention enable improved display quality and an improved LCD display manufacturing method.
- The foregoing embodiments are merely exemplary and are not to be construed as limiting the present invention. The present inventions can be readily applied to other types of apparatuses. The description of the present invention is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art.
Claims (4)
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KR1020000073270A KR100685944B1 (en) | 2000-12-05 | 2000-12-05 | Photo-alignment Material and Liquid Crystal Display Device fabricated with it |
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US09/893,977 US6627269B2 (en) | 2000-12-05 | 2001-06-29 | Photo-alignment material and liquid crystal display device |
US10/630,738 US7220467B2 (en) | 2000-12-05 | 2003-07-31 | Photo-alignment material and liquid crystal display device and its manufacturing method using the same |
US11/785,733 US8491973B2 (en) | 2000-12-05 | 2007-04-19 | Photo-alignment material and liquid crystal display device and its manufacturing method using the same |
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US10/630,781 Expired - Lifetime US6797096B2 (en) | 2000-12-05 | 2003-07-31 | Photo-alignment material and liquid crystal display device and its manufacturing method using the same |
US10/630,738 Expired - Lifetime US7220467B2 (en) | 2000-12-05 | 2003-07-31 | Photo-alignment material and liquid crystal display device and its manufacturing method using the same |
US11/785,733 Expired - Lifetime US8491973B2 (en) | 2000-12-05 | 2007-04-19 | Photo-alignment material and liquid crystal display device and its manufacturing method using the same |
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US10/630,738 Expired - Lifetime US7220467B2 (en) | 2000-12-05 | 2003-07-31 | Photo-alignment material and liquid crystal display device and its manufacturing method using the same |
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KR100685944B1 (en) * | 2000-12-05 | 2007-02-23 | 엘지.필립스 엘시디 주식회사 | Photo-alignment Material and Liquid Crystal Display Device fabricated with it |
US7563490B2 (en) * | 2004-12-06 | 2009-07-21 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device |
JP2007071928A (en) * | 2005-09-05 | 2007-03-22 | Hitachi Ltd | Liquid crystal display device |
WO2007032292A1 (en) * | 2005-09-15 | 2007-03-22 | Semiconductor Energy Laboratory Co., Ltd. | Manufacturing method of liquid crystal display device |
KR101666622B1 (en) * | 2009-08-26 | 2016-10-17 | 삼성디스플레이 주식회사 | Photoalignment agent and liquid crystal display device using the same |
JP5184492B2 (en) | 2009-11-19 | 2013-04-17 | 株式会社ジャパンディスプレイイースト | Liquid crystal display device and manufacturing method thereof |
US20140211140A1 (en) * | 2013-01-25 | 2014-07-31 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Alignment Film Material and Corresponding Liquid Crystal Panel |
DE102015200488A1 (en) * | 2015-01-14 | 2016-07-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Electrically controllable interference color filter and its use |
US10816855B2 (en) | 2015-10-29 | 2020-10-27 | The Hong Kong University Of Science And Technology | Composite photoalignment layer |
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US6797096B2 (en) | 2004-09-28 |
US7220467B2 (en) | 2007-05-22 |
US20040022963A1 (en) | 2004-02-05 |
US8491973B2 (en) | 2013-07-23 |
US6627269B2 (en) | 2003-09-30 |
US20020071079A1 (en) | 2002-06-13 |
KR100685944B1 (en) | 2007-02-23 |
US20040022964A1 (en) | 2004-02-05 |
KR20020044270A (en) | 2002-06-15 |
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